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h(5)= 5p + q = -42
h(-2)= -2p + q = 7
lalu dikurangi, jadi
7p = -49
p = -7
lalu p disubstitusikan ke salah satu persamaan
-2p+q=7
-2(-7) + q = 7
14 + q = 7
q = 7-14
q = -7
h(12)= 12p+q = 12(-7) + (-7) = -84 - 7 = -91
7=-2p+q
eliminasi spya q nya ilang
-49=7p
p=-7
nyari q bsa pake eliminasi / substitusi
klo substitusi
7=-2p + q
7= -2.-7+q
7=14+q
q=-7